Search found 213 matches

by mauimart
Dec 13 2017 3:00am
Forum: Electric Aircraft
Topic: E-Hawk: Electric Aircraft Build
Replies: 1
Views: 659

E-Hawk: Electric Aircraft Build

We just started our build of the EMG-6 Motor Glider. Details can be found at our website: www.e-hawk.org We are still in the very early stages of the build process and have not spec'd the propulsion system as of yet. If anyone has any recommendation for an appropriately sized motor (10kW to 15kW con...
by mauimart
Sep 28 2017 1:41pm
Forum: Electric Aircraft
Topic: New Passenger Drone
Replies: 0
Views: 595

New Passenger Drone

Here's a new entry into the passenger drone market.

http://passengerdrone.com/

Anyone recognize the motors?
by mauimart
Jul 10 2017 2:39pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 471
Views: 58708

Re: low cost DIY battery spot welder

Simple sophistication. Brilliant! Have you tried to weld 0.2mm nickel strip with the 5Ah battery?
by mauimart
Jun 22 2017 7:33pm
Forum: Electric Aircraft
Topic: Farfles Electric Ultralight.
Replies: 196
Views: 18452

Re: Farfles Electric Ultralight.

Can you clarify the battery pack? Is it 29Ah total or 4 x 29Ah? The latter would make a 12kWh pack. And what is the anticipated weight of battery?
by mauimart
Jun 22 2017 2:10pm
Forum: Electric Aircraft
Topic: Farfles Electric Ultralight.
Replies: 196
Views: 18452

Re: Farfles Electric Ultralight.

Great project--can't wait to see it flying. What's the kV of that motor and what is the gear reduction? What size prop are you planning on spinning? I am going to be embarking on a similar project with high school students. Starting in September we will be fabricating the EMG-6 (https://electricmoto...
by mauimart
Apr 06 2017 10:45pm
Forum: E-Bike General Discussion
Topic: Show Us Your Homemade Battery Housing
Replies: 556
Views: 138549

Re: Show Us Your Homemade Battery Housing

@teslanv
Hey, looks kinda like mine https://endless-sphere.com/forums/viewt ... =1&t=85489 without the screws. Are you going to cut a section out of the frame and weld it in? Did you cut the panels with a water jet? Nice.
by mauimart
Apr 05 2017 11:40am
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

Re: My First 18650 Battery Pack - KFF

More progress. I added a bracket for the motor controller and the circuit breaker. Also installed a precharge switch and controller enable switch. Current shunt is also installed via a 3D printed holder.
by mauimart
Mar 19 2017 9:47pm
Forum: Items for Sale - New
Topic: Bulk Pricing: Sanyo NCR1865GA $4.50 USD each
Replies: 4
Views: 911

Re: Bulk Pricing: Sanyo NCR1865GA $4.50 USD each

I ordered 20 LG 18650MJ1's over a year ago from Fasttech and the transaction went well. $5.80 per cell including shipping.
by mauimart
Mar 18 2017 4:45pm
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

Re: My First 18650 Battery Pack - KFF

Looking good. What is the housing material? It's 6061 aluminum, 5mm top plate, 3mm all other plates. Fasteners are M3. Cool battery box, but doesn't that Bomber fork have enough travel for the wheel to hit the battery enclosure? It does look like the tire will hit under compression yet bouncing up ...
by mauimart
Mar 17 2017 4:32pm
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

Re: My First 18650 Battery Pack - KFF

Some progress in pictures...
by mauimart
Jan 09 2017 2:39pm
Forum: Battery Technology
Topic: First Big Lion build.
Replies: 7
Views: 554

Re: First Big Lion build.

I am in the process of doing something similar (https://endless-sphere.com/forums/viewtopic.php?f=1&t=85489 ). Here's some advice based on my experience so far: The nickel strip you have linked in not pure nickel but rather nickel plated steel. It will rust sooner than later. Here is the one I went ...
by mauimart
Jan 06 2017 5:57pm
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

Re: My First 18650 Battery Pack - KFF

Your cell holders are perfect/sweet. Did you print them or order them from someone else? I designed the holders using Onshape, which BTW rocks, (search '18650 battery spacer') and printed in ABS on a Prusa. That's pretty bad. :shock: Interesting that while it vaporized parts of the cell itself, the...
by mauimart
Jan 06 2017 2:17pm
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

Re: My First 18650 Battery Pack - KFF

I made a small amount of progress on the pack, just prior to a significant setback. I soldered the end connections to a strip of nickel plate and then spot welded the plate to the terminals of the pack. I was quite pleased with the connections and confident that it would hold up to the expected 80A ...
by mauimart
Dec 21 2016 7:02pm
Forum: General Discussion
Topic: My First 18650 Battery Pack - KFF
Replies: 23
Views: 3142

My First 18650 Battery Pack - KFF

This is my first attempt at a 18650 pack build. The pack will be fitted to a Specialized Big Hit running a first generation MXUS in a 24" wheel. I still have to build an enclosure for the pack. Specs are as follows: - 20S8P using Sanyo NCR18650GA cells (from tumich) - Custom designed and 3D printed ...
by mauimart
May 27 2016 1:09am
Forum: E-Bike General Discussion
Topic: Hub Motor as a Generator
Replies: 15
Views: 1187

Re: Hub Motor as a Generator

Here is a system I put together. It consists of a cheap rear hub motor connected to a 3-phase rectifier which in turn feeds a DC/DC converter. It will do 300W if the rider is up to it.

https://endless-sphere.com/forums/viewt ... =3&t=56895
by mauimart
Mar 08 2016 8:31pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 599
Views: 48439

Re: JP spot welder

Where did you get that spot welder? DIY or ready made? Nice info on the little LCD screen :) It's my own creation based on what others have done here on the forum. Basically the same design as JP with an added user interface that allows me to select and view weld pulse times. I also have a counter ...
by mauimart
Mar 08 2016 6:51pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 599
Views: 48439

Re: JP spot welder

In regards to the electrodes sticking I have found that High Strength 182 copper works better than some of the other copper alloys. It's specifically designed for resistance welding. I got some 1/8" rod from McMaster. http://www.mcmaster.com/#catalog/122/3802/=11gefmk . I filed the tips into dome sh...
by mauimart
Apr 16 2015 2:26am
Forum: Stand-up E-scooters and E-skateboards
Topic: arduino speedometer
Replies: 7
Views: 1695

Re: arduino speedometer

Use a hall sensor instead of a reed switch. I have created Arduino based speedometers and tachometers. For the tachometers I simply mount a hall sensor outside of the outrunner can. You could just as easily mount a magnet to your wheel and have the hall sensor pick up on that. In the video below you...
by mauimart
Mar 16 2015 9:19pm
Forum: E-Bike Non-hub Motor Drives
Topic: RC Mid drive project - trial/freeride style
Replies: 146
Views: 26525

Re: RC Mid drive project - trial/freeride style

I didn't see which controller you will be using. For this motor, add four of the low-ESR capacitors to the ESC inputs. Many ESCs have died to discover this need: http://endless-sphere.com/forums/viewto ... 25#p382837 The gold part of the RC motor that mounts to the base-plate will get hot, so if yo...
by mauimart
Mar 11 2015 11:30pm
Forum: E-Bike Technical
Topic: MXUS 3000 Hub Motor - V1 V2 V3
Replies: 1872
Views: 28245

Re: MXUS 3000 Hub Motor

I have a Specialized Big Hit (135mm dropout) and MXUS laced in the stock P35D 24" wheel. After installing the wheel, I noticed a bit disturbing wheel offset of 8mm from the center line to the derailleur side. The tire has only a few mm space between the side of the swing arm. How much offset is acc...
by mauimart
Mar 01 2015 11:44pm
Forum: E-Bike Technical
Topic: The wheel-building spoke-lacing thread, post your tips
Replies: 231
Views: 33297

Re: The wheel-building spoke-lacing thread, post your tips

I ended up drilling new holes, 3mm diameter, countersunk, at 20mm on center to lace up my 24" rim with MXUS 3000 motor. Spokes are Sapim 13 gauge by 135mm but could have been 2mm shorter. I think they ended up being longer than what the spoke calculator specified because I laced them with the elbow ...
by mauimart
Jan 11 2015 10:41pm
Forum: E-Bike Technical
Topic: The wheel-building spoke-lacing thread, post your tips
Replies: 231
Views: 33297

Re: The wheel-building spoke-lacing thread, post your tips

Mauimart- use one cross. 12g will be too thick for the rim. Ideally you would redrill the hub flange with smaller holes for 13/14 butted spokes that are also closer together to reduce the angle. Otherwise you will need to use washers. How does this look? Paired hole spacing at 20mm. Not sure what t...
by mauimart
Jan 11 2015 3:26pm
Forum: E-Bike Technical
Topic: The wheel-building spoke-lacing thread, post your tips
Replies: 231
Views: 33297

Re: The wheel-building spoke-lacing thread, post your tips

I am looking for some advice on my first wheel build. It's a MXUS 3000 hub motor and an Alienation Blacksheep 24" rim (http://shop.alienationbmx.com/black-sheep.html). I have run the spoke length calculations for both 0-cross and 1-cross pattern using the Grin spoke calculator. The hub spoke hole di...